email reply failures

D

danw

I have client using Outlook 2003 where when she tries to
reply to an email message from someone on the same ISP as
hers, she gets an error message saying the message could
not be delivered because the person does not have an
address at this location. The error code is #5.1.1.
However, if she resends the message it is delivered ok.
Can anyone give me an idea on what I can do to fix this
problem?
 

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